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The significance of Opiliones in evolutionary developmental biology. (a) Consensus phylogeny of Chelicerata (based on [5]) and inferred WGD events in Xiphosura and Arachnopulmonata. (b) Adult male P. opilio climbing on a twig using its prehensile tarsi. (c) Detail of the distal subdivisions (tarsomeres) of the leg 2 tarsus. The distal terminus is to the right. White bars mark tarsomere boundaries. Photographs: Caitlin M. Baker. (Online version in colour.)
